East River

The East River is a river strait in New York City. The East River connects Upper New York Bay on its south end to Long Island Sound on its north end. The East River separates Long Island (including the boroughs of Queens and Brooklyn) from the island of Manhattan and the Bronx on the North American mainland. In reference to The East River connection to Long Island Sound, it was once also known as the Sound River.

The East River was formed approximately 11,000 years ago at the end of the Wisconsin glaciation. The distinct change in the shape of the river channel between the lower and upper portions is evidence of this glacial activity. The upper portion (from Long Island Sound to Hell Gate), running largely perpendicular to the glacial motion, is wide, meandering, and has deep narrow bays on both banks, scoured out by the glacier's movement. The lower portion of The East River (from Hell Gate to New York Bay) runs north-south, parallel to the glacial motion. It is much narrower, with straight banks. The East River bays that exist (or existed before being filled in by human activity), are largely wide and shallow.

The East River is dangerous to people who fall in or attempt to swim in it, although as of mid-2007 the water was cleaner than it had been in decades. Anyone in the channel would find there are few places to climb out. According to the marine sciences section of the city Department of Environmental Protection, the channel is swift, with water moving as fast as four knots (just as it does in the Hudson River on the other side of Manhattan). The East River speed can push casual swimmers out to sea. A few people drown in the rivers around New York City each year. The strength of The East River current foiled an effort in 2007 to tap it for hydroelectricity.

Historically, the lower portion of The East River (separating Manhattan from Brooklyn) was one of the busiest and most important channels in the world, particularly during the first three centuries of New York City's history. The Brooklyn Bridge, opened in 1883, was the first bridge to span the river, replacing frequent ferry service. Some East River passenger ferry service remains between Queens and Manhattan.
The Bronx River drains into the East River in the northern section of the strait.
North of Wards Island, it is joined by the Bronx Kill. Along the east of Wards Island, at approximately the strait's midpoint, it narrows into a channel called Hell Gate, which is spanned by both the Triborough Bridge, and the Hell Gate Bridge. On the south side of Wards Island, it is joined by the Harlem River.
Newtown Creek on Long Island drains into the East River, forming part of the boundary between Queens and Brooklyn. The East River contains a number of islands, including:
Upper section
Rikers Island
North Brother Island
South Brother Island
Mill Rock
Lower Section
Roosevelt Island
U Thant Island (Belmont Island)
Wards Island and Randall's Island (joined by landfill)

The Brecker Brothers performed a song named after the East River and is featured on their 1978 album Heavy Metal Be-Bop.
Kramer decided to swim in the East River for exercise in the Seinfeld episode The Nap.